Are VELUX windows secure?

Burglary is mostly about opportunity and speed. A ground-floor door or a rear window can be reached from the garden, worked on out of sight and climbed straight through. A roof window offers none of that. It is several metres up, reached only across a pitched roof or off a ladder in full view, and angled so that anyone working on it has nothing solid to brace against. That alone moves it far down the list of ways into a house.

Position does most of the work here, and it is worth being honest about it rather than crediting the ironmongery for everything. On a loft conversion the glass is often two storeys off the ground. Even on a single-storey rear extension the flat or shallow-pitched rooflights sit above head height and away from any foothold. An opportunist looking for a quick way in walks past a roof entirely.

The exception is a roof window a determined person can actually stand next to: one on a low outbuilding, above a flat-roofed extension that is easy to climb onto, or reachable from a neighbouring wall. Those are the ones worth specifying carefully, and they are the reason the locking and the glass still matter even though the average roof window is left alone.

The pane is where most of the real security lives, and it is the part buyers tend to overlook. Current VELUX units are typically built with a toughened outer pane and a laminated inner pane. Toughened glass resists a knock and, if it does go, breaks into blunt granules rather than shards. Laminated glass is two sheets bonded to a plastic interlayer, so when it cracks it holds together in the frame instead of falling out. You cannot punch a clean hole through it and reach the handle, and you cannot knock the whole pane out in one go.

That laminated inner pane is doing double duty. Under Building Regulations Part K, glazing in certain positions has to be safety glass so that nobody falls through it or is cut by it, and laminated glass satisfies that alongside its security job. So the same specification that keeps a person safe leaning near the glass also makes it a stubborn barrier to force. When a unit is being replaced, the glass build-up is the thing to confirm on the specification sheet rather than assume, because older rooflights coming out may predate laminated inner panes entirely.

If a roof window is within reach and security is the priority, you can ask for laminated glass on both panes rather than just the inner one. It costs a little more and it is rarely needed at height, but on that low, climbable rooflight it is a sensible thing to request before the unit is ordered.

A VELUX window is opened and held by a control bar or handle along the top or bottom of the sash, and it locks into the frame when closed. The mechanism is designed so the sash cannot simply be levered up and out of its seals. On centre-pivot and top-hung units the same handle that operates the window also draws it tight shut, so a closed window is a locked window rather than one merely resting in place.

The ventilation flap is the part people miss. Most VELUX roof windows have a built-in air vent in the top of the frame that lets a trickle of fresh air through with the window shut and latched. That means you do not have to leave a sash propped open overnight for airflow, which removes the one situation where a roof window is genuinely vulnerable. A window standing open on its first catch is far easier to work than one closed and locked with the vent doing the breathing.

For rooms that double as an escape route, or where a window has to open far enough to climb out in a fire, the opening and its restriction need thinking through together with Part K. Getting out easily and keeping people from getting in pull in slightly different directions, and the right answer depends on the room. This is one of the details worth settling as part of a proper VELUX window installation rather than after the unit is already in.

Around Southend the roofs that most need a good rooflight are the south-facing ones, because the city faces south across the estuary and those rear extensions and loft rooms collect sun from mid-morning until late afternoon. That pulls two requirements onto the same pane. You want a laminated build-up for security and safety, and you want a low G-value so the room does not overheat behind it.

Those two do not fight each other. A solar-control coating goes onto the same double-glazed unit that carries the laminated inner pane, so you can have a window that resists force, holds together if it breaks, and keeps a good part of the summer heat out at the same time. On a bright day the reflected light off the water adds to the load, which is why we treat the glass specification as one decision covering security, safety glazing and solar gain together. It is the heart of our energy-efficient skylight installation work, and it means the south-facing window is specified once for all three jobs rather than compromised on one to satisfy another.

The product sets a high floor. What decides the outcome on your roof is how it is fitted. A roof window is only as secure as the timber and the upstand it is anchored to, the flashing that seals it to the surrounding roof, and the fixings that hold the frame square. A unit dropped into a rotten or undersized surround can be worked loose no matter how good the sash lock is, and a poor weather seal is a bigger day-to-day problem than any burglar.

So the checklist is short. Confirm the glazing is laminated on the inner pane at least, and on both panes if the window is reachable. Make sure the ventilation flap is specified so you never need to leave it open. Check the opening and any restrictor suit how the room is used, especially if it is an escape window. And make sure whoever fits it builds a sound upstand and flashing on a pitched roof skylight installation, because that is where security, weather-tightness and lifespan are all won or lost.

If you want the glass build-up and the fixing detail settled properly before anything is ordered, tell us the roof orientation, the rough opening size and how reachable the window is. Ring 01702 898232, get in touch or request a quote, and we will specify the whole unit rather than just the hole it goes in.